"gradually" (l.16) means little by little.

"as well" (l.7) is a comparative of equality.

students can improve their writing by themselves.

students ought to be kept away from their teachers to better perform written tasks.

teachers should have a clear understanding of how the acquisition of written skills can be achieved when designing curriculum or shaping classes.

teachers in training must emphasize the importance of curriculum design.

for the typical student, acquiring reading skills is more difficult than learning how to write well.

to write well can be said to be the most complex of the four abilities involved in learning a foreign language.

to write well in a second language requires a lot of training.

written discourses ought to keep the same features regardless of those who are going to read it.